Years at Purdue University from 1928 to the present, with special emphasis on his work during World War II on germanium. Major topics include his childhood, how he came to Purdue, the cyclotron built at Purdue in the 1930s, his work on the DC properties of germanium rectifiers under Karl Lark-Horovitz, the transition to peacetime work, and his relationship with Karl Lark-Horovitz.